Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!apple!voder!tolerant!al
From: al@tolerant.UUCP (Albert Palmer)
Newsgroups: comp.sys.atari.st
Subject: Re: Bad RAM?
Message-ID: <4112@tolerant.UUCP>
Date: 25 Apr 89 16:10:58 GMT
References: <111500017@uxa.cso.uiuc.edu>
Reply-To: al@tolerant.UUCP (Albert Palmer)
Organization: Tolerant Systems Inc., San Jose
Lines: 19

In article <111500017@uxa.cso.uiuc.edu> sfn20715@uxa.cso.uiuc.edu writes:
>
>I recently upgraded my ST from 512K to 2.5 Meg.  Among other things, I noticed
>flashing lines on the screen, which multiply to blot out the entire 
>screen and eventually crash the program.  I know this did not happen before
>I upgraded my ram.

I have installed many upgrades to 520s and 1040s.  I have had nothing but
problems with the EZRam upgrade.  I've had the problem you're having on
almost every ST with the newer MMU chip.  When I install the older MMU the
problem goes away.  The other way I found to fix it was to remove the
long cable that goes to the MMU and the resistor packs and solder wires
from one of the center mem chips on the EZRam to one of the center men chips
on the 520.  I used wire wrap wire about 5 inches long.  A friend of mine
has been using that ST as a BBS for about 4 months.  The upgrade board
I've had the best luck with is the New World Software.  It solders in
and uses bus drivers on all lines.  Costs about the same as the EZRam.

al palmer